- vsnet-alert - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-alert 27965] TCP J19582065+5506531: new SU UMa-type dwarf nova
by Taichi Kato 16 Nov '23

16 Nov '23

TCP J19582065+5506531: new SU UMa-type dwarf nova The most recent observations by Itoh-san (Nov. 15) showed clear superhumps (period about 0.059 d). They were developing on Nov. 14.

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[vsnet-alert 27964] TCP J20315286+2740166: ordinary superhumps
by Taichi Kato 16 Nov '23

16 Nov '23

TCP J20315286+2740166: ordinary superhumps Osaka Kyoiku U team, Kyoto U team, Itoh-san, Kiyota-san, Stephen Brincat and Tamas Tordai have reported observations. Ordinary superhumps started to appear on Nov. 12 and the current superhump period is 0.05694(7) d. The small amplitude 0.035 mag and the profile suggest that they are still in stage A.

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[vsnet-alert 27963] TCP J20315286+2740166: likely early superhumps
by Taichi Kato 06 Nov '23

06 Nov '23

TCP J20315286+2740166: likely early superhumps Osaka Kyoiku U team, Itoh-san and Stephen Brincat have reported observations. There are likely early superhumps with a period of 0.0552(2) d and an amplitude of 0.035 mag. The baseline is still short and the result is preliminary.

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[vsnet-alert 27962] TCP J18433189+1011051: new SU UMa star
by Taichi Kato 04 Nov '23

04 Nov '23

TCP J18433189+1011051: new SU UMa star According to Itoh-san's observations on Nov. 3, this object showed superhumps with a period of about 0.065 d.

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[vsnet-alert 27961] PS1-3PI J063334.87-230546.4 = Gaia DR3 2924954955730613376 = TCP J06333486-2305449: SU UMa star
by Taichi Kato 04 Nov '23

04 Nov '23

PS1-3PI J063334.87-230546.4 = Gaia DR3 2924954955730613376 = TCP J06333486-2305449: SU UMa star According to Itoh-san's observations on Nov. 3, this object showed superhumps with an amplitude of 0.17 mag. The period of 0.0597(4) d excludes the possibility of an AM CVn star as I suggested earlier. The period was close to the half of this superhump period and the variations may have been early superhumps, though two maxima were almost equal. The nature will be clarified when a better measurement of the superhump period is obtained.

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[vsnet-alert 27960] PS1-3PI J063334.87-230546.4 = Gaia DR3 2924954955730613376 = TCP J06333486-2305449: superoutburst from a most likely AM CVn star
by Taichi Kato 02 Nov '23

02 Nov '23

PS1-3PI J063334.87-230546.4 = Gaia DR3 2924954955730613376 = TCP J06333486-2305449: superoutburst from a most likely AM CVn star Kiyota-san, Itoh-san and Josch Hambsch have reported observations. The data show superhumps with a period of 0.02942(2) d. Amplitude 0.043 mag. The low amplitude seems to suggest a low mass ratio, consistent with an AM CVn star. The data are still somewhat insufficient and more observations are needed.

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[vsnet-alert 27959] AT 2023veq (Vend55): bright nova candidate in M31
by FIDRICH Robert 18 Oct '23

18 Oct '23

Dear Friends, We have discovered a bright nova candidate in M31 on at around 18.6 magnitudes using 2x120s co-added images made om October 16.9870 UT with 0.32m telescope of the iTelescope.net network remotely at Nerpio, Spain with Luminance filter. AT 2023veq (Vend55) has significantly brightened in the 24 hours since it's discovery: by October 17.9082 UT the quest star has reached 17.7 magnitudes. More details: - http://vendegcsillagkereso.blogspot.com/2023/10/vend55-at-2023veq-bright-no… - https://www.wis-tns.org/object/2023veq - www.cbat.eps.harvard.edu/unconf/followups/J00433237+4138211.html Further photometric and spectroscopic follow-up observations are encouraged! Clear skies, Robert Fidrich and Tamas Tordai "Vendégcsillag-kereső" (Guest Star Hunter) team HAA/VSS

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[vsnet-alert 27958] ASASSN-23gr: new SU UMa-type dwarf nova
by Taichi Kato 14 Oct '23

14 Oct '23

ASASSN-23gr: new SU UMa-type dwarf nova Josch Hambsch has reported observations. The data show superhumps with a period of 0.06345(5) d. The amplitude is rather small (0.04 mag) and may be still growing.

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[vsnet-alert 27957] SDSSJ170810.31+445450.7 outburst
by Tadashi Kojima 11 Oct '23

11 Oct '23

object YYYYMMDD(UT) mag code SDSSJ170810.31+445450.7 20231010.397 133c Tko SDSSJ170810.31+445450.7 20231011.402 142c Tko Observer: Tadashi Kojima (Tsumagoi,Gunma, Japan) Instruments: f.l.=200mm,300mm lens + Canon EOS 6D

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[vsnet-alert 27955] Any news about T. Kato?
by Josch Hambsch 11 Oct '23

11 Oct '23

HI, any news about Taichi Kato? He has not been providing feedback on stars on VSNET since a couple of weeks. What happened to him? I hope we will get an answer from his collaborators. Looking forward to any reply. Best regards, Josch Hambsch

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